Si4712/13-B30
18
Rev. 1.1
4. Universal AM/FM RX/FM TX Application Schematic
Figure 12 shows an application schematic that supports the Si47xx family of 3 mm x 3 mm QFN products,
including the Si4702/3/4/5 FM receivers, Si471x FM transmitters, Si472x FM transceivers, and Si473x AM/FM
receivers.
Figure 12. Universal AM/FM RX/FM TX Application Schematic
Following the schematic and layout recommendations detailed in AN383: Universal Antenna Selection and Layout
Guidelines will result in optimal performance with the minimal application schematic shown in Figure 12. Universal
AM/FM RX/FM TX Application Schematic . System components are those that are likely to be present for any tuner
or transmitter design.
C4
1 nF
L
HEADPHONE
270 nH
System Component
U1
Si47xx
NC
FMI
RFGND
TXO/AMI
RST
GND/RIN/DOUT
LOUT/DFS
ROUT/DIN
GND
VDD
1
2
3
4
5
15
14
13
12
11 7 8 9
C1
VBATTERY
2.7 to 5.5 V
LIN
L
SHORT
120 nH
22 nF
R12
0 ?/DIV>
GPIO1
GPIO3
GPIO2
R13
0 ?/DIV>
VBATTERY
2.7 to 5.5 V
Si4702/03: Populate R12, R13, R21, C14, and C15
Si4704/05/1x/2x/3x Analog: Populate C7, C8, C14
and C15 as shown
Si4704/05/1x/2x/3x Digital: Populate R16, R17,
R18, R19, and R20 as shown
C14/R19
0.39 uF/ 0 ?/DIV>
SEN
SCLK
SDIO
RST
RCLK
VIO
C15/R20
0.39 uF/ 0 ?/DIV>
C7/R17
0.39 uF/ 2 k?/DIV>
RIN
C8/R18
0.39 uF/ 600 ?/DIV>
System Components
C17/R21
3.3pF/0 ?/DIV>
L
FERRITE
180
600 uH
FB1
2.5 k?@ 100 MHz
FB2
2.5 k?@ 100 MHz
HP Jack
J1
S 1
R 2
T 5
Right
Audio
Left
Audio
U2
Headphone Amplifier
System Component
R14
0 ?/DIV>
R16
2 k?/DIV>
C16
470 nF
FM Embedded RX/TX Antenna
AM Ferrite Antenna
System Component
L1
10 nH
System Component
D5
D4
D3
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